When Welker asked him to respond to critics who have called him a spokesperson for Snowden, Greenwald said the idea was "ludicrous" because "every journalist has an agenda."

"We're on MSNBC now, where close to 24 hours a day, the agenda of President Obama and the Democratic Party is promoted, defended, glorified . . . that doesn't mean that the people who appear on MSNBC aren't journalists," he said. "They are."

He added that he has been "clear" about his support for Snowden's actions and that his reporting has been "accurate and reliable."

"I think the point is not so much about MSNBC and what happens here but more that sometimes when you talk about Edward Snowden, you do defend him, and some people wonder if that crosses a line," Welker responded.

"Sure, I do defend him just like people on MSNBC defend President Obama and his officials and Democratic party leaders 24 hours a day," Greenwald argued.

"Not everyone on MSNBC does that 24 hours a day," Welker interjected. "No, not everybody, but a lot of people on MSNBC do," Greenwald said.

Greenwald reiterated that he "absolutely" defends Snowden, and the two went on to discuss what lies ahead for Snowden, who currently has temporary asylum in Russia.